Television receiver



Aug. 12, 1958 J. c. JANSSEN TELEVISION RECEIVER Filed March l, 1955 INVENTOR JOHANNES CORNELIS JAN SSEN United States Patent O i American Philips Company, Inc., New York, N. Y., a

corporation of Delaware Application March 1, 1955, Serial No. 491,478

Claims priority, application Netherlands March` 6, 1954 S Claims. (Cl. 3404-367) The present invention relates to television receivers. More particularly, the invention relates to a device for mounting a cathode-ray tube comprising a metal cone in a receiver cabinet.

The mounting of a large cathode-ray tube, for example of a (maximum) picture screen diameter of 21 inches, in the cabinet of a television receiver presents difficulties because such large tubes generally cannot be manufactured with small tolerances relative to the dimensions of the screen; this .applies particularly to tubes comprising a metal cone.

Since the said tolerances may be to 10 millimeters, it is not possible without further expedients to determine the position of the screen in the receiver cabinet by providing a protruding supporting edge or rim narrowly surrounding the screen; if a new tube were to replace the installed tube, the edge of the new tube would generally not fit in the supporting edge.

According to the invention this disadvantage is obviated providing at least three metal lugs welded to the cone of the tube adjacent the picture screen; by means of said lugs the tube is secured to a supporting member arranged in the cabinet of the receiver.

Preferably the lugs are supported from a protruding edge made of insulating material and surrounding the viewing aperture of the receiver cabinet.

In order that the invention may be readily carried into effect, it will now be described more fully with reference to the accompanying drawing, in which:

Fig. l is a back elevation of an embodiment of a television receiver cabinet in accordance with the invention; and

Fig. 2 is an axial crosssectional view taken along the broken line Il-II of Fig. 1.

Figs. l and 2 show the part of a television receiver cabinet which is essential to the invention, the receiver cabinet comprising a rectangular cathode-ray tube 1 arranged in, for example, a wooden cabinet 3. The picture screen 5 of the tube 1 is arranged in the usual manner behind a substantially rectangular viewing aperture 7 formed in the front-wall of the cabinet 3 (Fig. 2). A so-called mask 9 of insulating material is provided between the tube 1 and said front-wall. The mask 9 conceals the edge of the picture screen S and also acts to insulate the edge of the metal cone 11 of the tube 1 from the cabinet 3. As may be seen from Fig. 2, the mask 9 is channel-shaped in cross-section and is secured to the front-wall of the cabinet 3.

As has been mentioned hereinbefore, the dimensions and the shape of the picture screen 5 are subject to comparatively large tolerances and the mask 9 cannot be designed so that its protruding outer edge 13, for example, narrowly tits the edge of the picture screen 5. In order to ensure that the screen 5 invariably occupies the correct position relatively to the boundary of the viewing aperture 7, which boundary consists of the inner edge 15 of the mask 9, four lugs are welded to the metal cone 11 of the tube adjacent the four rounded corners of the 2,347,6b5 Patented Aug. 12, 19155 ICC i?. picture screen 5. Each lug consists of an iron strip 17 to which an extension shaped in the form` of a second strip 19 is screwed by means of screw bolts 21. The planes of the strips 17 and 19 are parallel to the axis of the tube 1. Each strip 19' comprises a forked partwhich embraces the protruding edge 13 sothat the position of the screen 5 relative to the mask 9 can be determined bymeans of thefour lugs 17, 19.` In order to enable* the correct position of the screen 5 to be adjusted, the strips 19 are adjustable relatively to` the fixed strips 17 due to the bolts 21V being passed through too large apertures in the strips 17. The tube 1 is held by a slightly resilient brace which is secured to the frame 23 of rthe receiver cabinet and embraces the neck 27 of the tube 1 at the junction with the conical portion 11 and exerts an axial force upon the tube inthe direction of the arrow 29. Thus, the strips 19 are continuously pressed against the protruding edge 13 which acts as the supporting member. The position of the extensions 19 relatively to the strips 17 can be such that between the edge 15 of the mask 9 and the picture screen 5 a slight intermediate space of, for example, 1 millimeter is left for the sake of insulation.

The viewing aperture 7 may be covered by a. safety pane (not shown) in the usual manner.

Instead of lugs consisting of two parts 17 and 19 use may be also made of lugs which are single units. In contradistinction to the strips 17 the said single unit lugs have to be welded to the cone 11 after said cone has been sealed to the screen 5, since deformations occur due to said sealing. Welding of the lugs to the cone can be effected in a jig in order to ensure their fitting the edge 13 of the mask 9. When bipartite lugs as shown in Figs. 1 and 2 are utilized, use may be also made of a jig for proper adjustment. In both cases, the cathode-ray tube may be replaced by a new tube which will be arranged in the correct position relatively to the viewing aperture without the need for further adjustment. The described arrangement has a further advantage in that the tube is secured in the cabinet by means of members arranged on the comparatively strong metal cone of the tube, the comparatively vulnerable metal-to-glass joint along the periphery of the screen not being loaded.

While the invention has been described by means of a specific example and in a specic embodiment, I do not wish to be limited thereto for obvious modifications will occur to those skilled in the art without departing from the spirit and scope of the invention.

What is claimed is:

1. A device for mounting a cathode-ray tube having a screen and a metal cone in a receiver cabinet, comprising at least three lugs welded at spaced intervals to said metal cone adjacent to the screen of said cathode-ray tube, said lugs protruding outwardly beyond the outer periphery of said screen, and a supporting member secured in said receiver cabinet and positioned around the periphery of said screen and engaging said lugs.

2. A device for mounting a cathode-ray tube having al screen and a metal cone in a receiver cabinet, comprising at least three lugs welded at spaced intervals to said metal cone adjacent to the screen of said cathode-ray tube, said lugs protruding outwardly beyond the outer periphery of said screen, and a supporting member secured in said receiver cabinet and positioned around the periphery of said screen and engaging said lugs, said supporting member having a projecting edge of insulating material surrounding the said screen.

3. A device for mounting a cathode-ray tube having a screen and a metal cone in a receiver cabinet, comprising at least three lugs welded at spaced intervals to said metal cone adjacent to the screen of said cathode-ray tube, said lugs protruding outwardly beyond the outer periphery of said screen, and a supporting member secured in said receiver cabinet and positioned around the periphery of said screen and engaging said lugs, each of said lugs having a part directly secured to said tube and an extension removably Xed to said part whereby said extension is adjustable and engages said supporting member.

4. A device for mounting a cathode-ray tube having a screen and a metal cone in a receiver cabinet, comprising at least three lugs welded at spaced intervals to said metal cone adjacent to the screen of said cathode-ray receiver cabinet, comprising at least three lugs Welded at spaced intervals to said metal cone substantially adjacent to the corners of the screen of said cathode-ray tube, said lugs protruding outwardly beyond the outer periphery of said screen and a supporting member secured in said receiver cabinet and positioned around the periphery of said screen and engaging said lugs.

References Cited in the file of this patent UNITED STATES PATENTS 2,428,928 Cain Oct. 14, 1947 2,497,078 Call Feb. 14, 1950 2,568,631 Hoellerich Sept. 18, 1951 2,682,620 Sanford June 29, 1954 2,684,477 Fisch July 20, 1954 

